Anisotropic density estimation for photon mapping

Photon mapping is a widely used technique for global illumination rendering. In the density estimation step of photon mapping, the indirect radiance at a shading point is estimated through a filtering process using nearby stored photons; an isotropic filtering kernel is usually used. However, using...

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Bibliographic Details
Published in:	Computational visual media (Beijing) 2015-09, Vol.1 (3), p.221-228
Main Authors:	Luan, Fu-Jun, Wu, Li-Fan, Xu, Kun
Format:	Article
Language:	eng
Subjects:	Artificial Intelligence Computer Graphics Computer Science Density Filtration Image Processing and Computer Vision Kernels Mapping Photons Radiance Rendering Research Article Sample size Shading User Interfaces and Human Computer Interaction
Online Access:	Get full text
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Summary:	Photon mapping is a widely used technique for global illumination rendering. In the density estimation step of photon mapping, the indirect radiance at a shading point is estimated through a filtering process using nearby stored photons; an isotropic filtering kernel is usually used. However, using an isotropic kernel is not always the optimal choice, especially for cases when eye paths intersect with surfaces with anisotropic BRDFs. In this paper, we propose an anisotropic filtering kernel for density estimation to handle such anisotropic eye paths. The anisotropic filtering kernel is derived from the recently introduced anisotropic spherical Gaussian representation of BRDFs. Compared to conventional photon mapping, our method is able to reduce rendering errors with negligible additional cost when rendering scenes containing anisotropic BRDFs.
ISSN:	2096-0433 2096-0662